Valve mechanism for internal-combustion engines



March 4, 1930. MASTERS 1,749,496

VALVE MECHANISM FOR INTERNAL COMBUSTION ENGINES Filed April 28, 1927 Patented Mar. 4, v1930 UNITED STATES PATENT oFFicE MARION GASKELL MA STERS, OF EVANSVILLE, INDIANA, ASSIGNOB, OF ONE-HALF TO BERNARD HENRY MASON, OF VANDERBURG COUNTY, INDIANA VALVE MECHANISM FOR INTERNAL-COMBUSTION ENGINES Application filed April 28,

The object of this invention is to provide a simple, easily adjusted, and efficient valve mechanism for internal combustion engines which will be provided with improvements tending to minimize the noise of operation of said valve mechanism.

My improvements embody novel means combined with the valve stems and with the rockers or levers which, under actuation by cams on the cam shaft, operate said valve stems. The mechanism in questionembodies improved housings flexibly arranged in relation to the operative ends of the rockers, said housings being so constructed that access v may be had to the interior thereof, without removing the housings, for the purpose of adjusting the valve tappets.

Other improved features and combinations'entering into the invention are fully set 2o forth hereinafter.

In the accompanying drawings:

Figure 1 is a vertical section;

Fig. 2 is a side elevation; and

Fig. 3 is a detail sectional view of the housing, the upper end of the rocker, and related parts.

The crank case appears at 1, one of the cylinders is shown at 2, the crank shaft appears at 3, and one of the pistons is shown at 4.

The valve operating rockers, of which only one pair 5 is shown, one for the intake and one for the exhaust of the given cylinder 2, are mounted on a shaft 6 and provided with lower extensions 7 which carry adjustable tappets 8 adapted to be engaged by the cams 9 on the cam shaft ,10; only one of the cams is shown but it will be understood that there is a separate cam for each tappet 8.

Each valve is contained within a valve shell or bushing 11 screwed into the cylinder head and suitably arranged to receive the charge from the port 12 or to discharge the burnt gases therethrough as the case may be.

One of the valves is shown at 13, said A valve being adapted to seat on the innerend of the shell 11 and having a stem 14 which carries a cup-shaped flexible washer 15.

The upper end 16 of each rocker or lever 5 has screwed therein an adjustable tappet 17 which is provided wit-ha slotted outer end 1927. Serial No. 187,263.

18 and is held inits adjusted position by a clamp nut 19. The tappet 17 is arranged to engage the valve stem 14: but is adjusted so that it will be slightly separated therefrom as shown at 20 when the spring 25, hereinafter described, is at its maximum expans1on.

The upper end 16 of the rocker 5 and the tappet 17 are adapted to operate inside of an improved housing 21. The valve stem 14 is slidably mounted at 22 in one end of said housing and is provided with a pin 23, located inside the housing, to limit the movement of the stem 14:. A spring 24, interposed between the outer end of the shell ll'and the washer 15, normally holds the valve 13 on its seat.

Located within the housing 21 is a spring 25 which bears against the upper end 16 of the rocker 5 and against the outer end of the housing.

normal position.

The housing is provided with a slot 26 to enable a wrench to be introduced for the purpose of tightening the nut 19. The outer end of the housing has an opening 27 to admit a screw driver so that it may be inserted in the slot 18 for the purpose of attaching the tappet 17.

In the lower part of the housing there is aslot 28 in which the upper end 16 of the rocker 5 plays.

The spring 25, by cushioning the rocker 5 prevents noisy action and enables the valve mechanism to operate in a relatively silent manner, whereas adjustment of the tappet 17 may be readily had to provide for proper opening of the valve 13, without having to take 05 any parts because a screw driver may be inserted through the opening 27 and a wrench through the slot 26.

If the engine back fires, when it is being cranked, the slot 28 will enable the rocker 5 to reverse and the spring 25 will cushion such reversal.

The springs 25 not only serve as cushions should back-firing occur but they act as re This spring surrounds the outer end of the tapper and it serves as a resilient means operating with the rocker to hold it in a housing carried by the stem of the valve,

turn springs for the rockers 5, and they insure relatively silent operation.

The connections between the tappets 8 and the lower parts 7 of the rockers are adjustable, enabling any desired adjustment as between the tappets 8 and the cams 9 to be had.

When the back-firing occurs, the cushioning action of the springs 25 will minimize the effect thereof because they cushion the action of the valves and thus lessen the violent reversal of motion Which occurs, hence materially lessen the reaction.

What I claim is:

1. In a valve mechanism for internal combustion engines, the combination With avalve for a cylinder of said engine, of a valve operator, a valve tappet having a screw threaded connection to the valve operator. and adapted for operating the valve, a nut for securing said tappet in its adjusted position,

and a coil spring contained Within the housing and bearing on it and on the valve op erator, said spring serving as a cushion for thevalve operator, said housing being pro vided With openings for the introduction of means to adjust the tappet and its securing device and to permit the play of the valve op erator.

2. In a-valve mechanism for internal combustionengines, the combination With acylinder thereof, of a reoiprocatory valve therefor which has a stem,a housing carried by the valve stem, a spring for seating the valve,

. a valve operator Whose end is received Within said housing, an adjustable tappet carried by said valve operator which is adapted to engage the valve stem, and a coil spring serving as a cushion for the valve operator, said spring being contained Within the housing.

In testimony whereof I aflix my signature.

MARION GASKELL MASTERS. 

